Puppy training help!

🦇𝓡

Got a new puppy. 12 weeks old. Currently house breaking. He was taught to go on puppy pads by the store we got him from we're slowly integrating them out (per training instructions). He pees outside, no problem. He pooped outside once yesterday with seemingly no problem, but other than that, he won't poop outside! He'll wait until we come back inside, I crate him to go make something to eat or take care of something, I walk out of the room for two seconds and he'll poop! (Yes, we are told to crate when unable to supervise so I don't wanna hear it.) We sat outside most of the day yesterday with breaks for me to eat and take care of laundry and get out of the heat, also for him to eat and drink. Still! Only once out of three times! Last night I fed him, waited 20 mins then took him outside and we sat out there for three hours! I brought him back in and he just laid down and went to sleep.

I need help. I'm 36 weeks pregnant tomorrow and I need him trained before baby comes. 😓

And of course as I hit post he poops outside 😂😂😂 How do I make this a consistent thing?